Keystones — Capstone
Five GCSE retrieval questions · 18 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² + 7x - 11
Answer: (x + 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 26cm, angle = 45°. Give your answer to 2 decimal places
Answer: 202.23cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 40:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 23, 51, 60, 45, 88, 14, 63
Answer: Mean = 54, Median = 55.5, Range = 74